🚀 go-pugleaf

This is a very simple question :-)
I want to open a file while specifying its RELATIVE location rather
than ABSOLUTE location (that is specific to my machine).

The problem is that I can find  the file only when I specify  the
absolute loacation 9asssuming that the file's name is 'song')

f = new File ("d:/song");
  if (!f.isFile())
     throw new FileNotFoundException ();

If I don't specify the absolute location,like :
f = new File ("song") 
the file isn't found and an exception is thrown.
(The class resides within the same sub-directory where the file is.)

I tried all sotrs of forms like f = new File ("./song") ,in vain ...

What am I doing wrong when specifying the file and relative path ?

What is a safe approach when opening a file from an application or
from an applet that has permissions to open a file ?

In addition, I would be also glad if you can refer me to a good
article regarding that.
Thanks

Ari
asenator@hotmail.com